Potato Starch-Based Film Incorporated with Tea Polyphenols and Its Application in Fruit Packaging

Area of Science:

• Food Science
• Materials Science

Background:

• Starch-based films are biodegradable but often lack sufficient barrier and functional properties.
• Tea polyphenols (TP) are natural antioxidants with potential to modify biopolymer characteristics.

Purpose of the Study:

• To investigate the effects of TP on potato starch-based film properties.
• To elucidate the interaction mechanism between TP and starch.
• To evaluate the application of TP-modified films in fruit packaging.

Main Methods:

• Fabrication of potato starch-based films with varying TP content.
• Characterization of physical properties (thickness, moisture, color, light transmittance, tensile, thermal).
• Assessment of barrier properties (water vapor, oxygen permeability) and antioxidant activity.
• Analysis of TP-starch interactions using Wide-Angle X-ray Diffraction (WXRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM).
• Evaluation of film performance in blueberry and banana preservation.

Main Results:

• TP incorporation altered film thickness, moisture content, color, and light transmittance.
• Improved barrier properties, including reduced water vapor and oxygen permeability, were observed with TP addition.
• TP enhanced the antioxidant activity of the starch films.
• WXRD, FTIR, and SEM revealed hydrogen bonding between TP and starch, forming non-crystalline complexes and altering film microstructure.
• TP-containing films successfully improved blueberry storage quality and inhibited enzymatic browning in bananas.

Conclusions:

• Tea polyphenols effectively enhance the physical, barrier, and antioxidant properties of potato starch-based films.
• Hydrogen bonding between TP and starch is the key interaction mechanism, modifying film microstructure.
• The developed TP-modified starch films show significant potential for application in active fruit packaging and preservation.